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11 <br /> IleCASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater CA 95301 Phone (209) 384 2930 <br /> 1 Certificate No 2079 Fax (209) 384 1507 <br /> Advanced GeoEnvironmental Inc Client Project ID Nomellini Method TPH-Diesel <br /> 1 of Northern California Reference Number 2550 Instrument ID HP GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 10-26 99 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 10-27-99 <br /> Attn Tim Cuellar Reported 11-10 99 <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> 1 <br /> ANALYTE TPH Diesel <br /> Spike Concentration 250 <br /> Units ug/L <br /> LCS Batch # TPHDW-0269 <br /> LCSA % Recovery 747% <br /> LCSB % Recovery 117% <br /> IControl Limits 55-130 % <br /> Relative % Difference 43 8% <br /> MS/MSD Batch # TPHDW-0269 <br /> MS % Recovery See Nate <br /> MSD % Recovery See Note <br /> Relative % Difference See Note <br /> Note Insufficient sample material to prepare MS/MSD samples LCS samples prepared in duplicate <br /> The LCS (Laboratory Check Sample) is a control sample of known, interferent free matrix that is fortified with representative analytes and <br /> analyzed using the same reagents, preparation and analytical methods employed for the samples The LCS % recovery is used for validation <br /> of sample batch results Due to matrix effects, the QC limits and recoveries for MS/MSD'. are advisory only and are not used to accept or <br /> reject batch results <br /> 1 <br /> ANALYST APPROVED BY <br /> Clair J one Jam G rl <br /> uonmenral Lab Director <br />